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A size comparison of the planets in the Kepler-37 system and objects in the Solar System. Below is a list of the smallest exoplanets so far ... at 0.02 Earth masses ...
For the small outer irregular moons of Uranus, such as Sycorax, which were not discovered by the Voyager 2 flyby, even different NASA web pages, such as the National Space Science Data Center [6] and JPL Solar System Dynamics, [5] give somewhat contradictory size and albedo estimates depending on which research paper is being cited.
Because of its small size, it is not expected to have an atmosphere. [6] Its radius is approximately 0.31 R 🜨 (about 1,980 kilometres (1,230 mi)), [2] slightly larger than the Moon [7] (0.27 R 🜨), but a little smaller than Mercury (0.38 R 🜨). Due to its small size, it is very likely Kepler-37b is a rocky planet with a solid surface. [6]
The planets in the Kepler-444 system have radii of 0.4, 0.497, 0.53, 0.546 and 0.741 Earth radii, respectively. Due to their size and proximity to Kepler-444, these must be rocky planets, with masses close to that of Mars. For comparison, Mars has a mass of 0.105 Earth masses and a radius of 0.53 Earth radii. System with largest total planetary ...
Sub-Earth exoplanets are among the most difficult type to detect because their small sizes and masses produce the weakest signal. Despite the difficulty, one of the first exoplanets found was a sub-Earth around a millisecond pulsar PSR B1257+12. The smallest known is WD 1145+017 b with a size of 0.15 Earth radii, or somewhat smaller than Pluto.
The smallest known extrasolar planet that might be a gas dwarf is Kepler-138d, which is less massive than Earth but has a 60% larger volume and therefore has a density 2.1 +2.2 −1.2 g/cm 3 that indicates either a substantial water content [ 19 ] or possibly a thick gas envelope. [ 20 ]
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